Lamp



Oct. 11, 1932. H. J. GRAHAM \1,882,135

LAMP

Filed April 15, 1929 5 SheetsSheet 1 FIG. 1.

INVENTOR. HERBERT JGRAHAM ATTORNEY.

H. J. GRAHAM Oct. 11, 1932.

LAMP

Filed April 15, 1929 3 Sheets-Sheet 2 INVENTOR. HERBERT J. GRAHAMATTORNEY.

H. J. GRAHAM Oct, 11, 1932.

LAMP

Filel April 15. 1929 5 Sheets-Sheet 3 INVENTOR.

HERBERT J. GRAHAM ATTORNEY.

Patented Oct. 11, 1932 *umrEosT-Arss HERBE T J. GRAHAM, or PH LAnELrnIA,

rnnns vnma, ASSIGNOR; r0 ELEQ'ITRIQ SERVICE SUPPLIES company, or PILADELP IA, PENNSYLVANIA, A contorte- TION OF PENNSYLVANIA I ApplicationfiledlApril 15,

This inventionrelates toelectric lamps and more particularly toelectrically operated flood lights, search lig ts, headlights and the,

like, which are intended for the projection of light over comparativelygreat distances or areas. I

The present invention is particularly adapted for use in connectionwith;lamps.

such as flood-lights, locomotive head-lights,

air-port lights and thelike, allof which are commonly characterized bythe fact that in eachcase the lamp body or housing is'pofsitionallyadjusted with relation to its support I to most effectively project thelight rays ina predetermined direction. Once this initial adjustmentbetween the lamp body and its support is obtained it is seldom disturbedunless altered circumstances necessitate achange thereof and so on. .Toperform this main,

tenance work without disturbing the correct adjustment between the;lampgbody and, its support is not always easy, this because of the factthat the adjustment is often such that the particular part of the lampbody Whichit is desired to reach is rendered inaccessible unless thelamp body be' swung'into a position other than its correctly setposition; Once the lamp body is swung out of its adjusted positionforpurposes of inspection, repair or its proper position and even'thenthere. is no assurance that the'proper readjustment has been made. V .j

It is accordingly among the principal ob,- jects of this invention toavoid the aforementioned difflculties bythe provision; of meansoperatively associated; with an indexing device for locking the lampbodya predeterminedly set position with-relation to the support for -saidlampbody, said means being operable: to perm-it the lamp body to beswung out of said position for purposes of inspection, repairs,replacement or thelike. 1

flight thus obviating the necessity LAMP 1a2s. "seria1 No. 355,182.

A. further object of'the invention is; the provision of a shiftablemember adapted to be secured in a predeterminedly fixedrelation to thelamp support, the lamp being ro- "tatable: freely upon said support,together Wlth eans carried by said shiftable member for lockingengagement with the lamp; Whereby to prevent rotation. of the latterwith respect to its support.

It will be understood, of course, that the' initial adjustmentbetween/the lamp body and itssupport must be eifected :at n ight inorder to insure the most effective projection oflight in a givendirection. Should this adjustment be disturbed, as when the lamp. iscleaned or inspected, it isordinarily necessary to again reset the lampbody at night. It is accordingly a still further ob- 'ject of thisinvention to provide means whereby the lamp body may be reset to itspredeterminedly adjusted position by daywork uponthelamp. V

Other objects of the invention and advantages. resulting therefrom willappear more fully hereinafter.

" .T he invention consists substantially the combination, construction,location,'and relative arrangement of parts, all'fas will appear morefully hereinafter, as shown. in the accompanying drawings and as finallypointed out in the appended claims. In'the said accompanying drawings,which for purposes of. illustration show the invention as embodied inone form oftypical lamp, the like, it requires; great care to reset'itto H Figure 1 is'a front elevational view of a lamp embodying thefeatures of the present invention Figure 2' is a side elevational' viewof the lamp looking toward the indexing mechanism, the l'amp' body beingshown. locked inp'osition for proj ecting" the light a sub-- of night Iner surfaces of the bracket arms 17 it being.

. and thrown'back into a position rendering it accessible formaintenance workto be performed thereon;

Figure am an enlarged elevational vlew of the indexing and lockingmechanism as operativelyassociated with adjacent parts of the'lamp bodyand the support therefor;

Figure 6 is a vertical sectional view taken onthe lines 66;of Figures 2and 5 {and 7 ;=F- igure' 7 is an elevational view; of the lockingmemberper se. g

Referringnow to the drawings, it willbei.

seen thatthe lamp body or casing 10 is substantially drum-shaped andcomprises an annular wall '12, a rear wall 11 and aswingf ably mountedfront door closure 13,' the latter being provided with theusual lens14.Housed Within this lamp casing 10 is a suit "able reflector (not'shown)and anelectric lamp 15 constituting the source of light which isprojected through the lens 14 in a predetermined direction. Supportingthe lamp'body 10 for angular adjustment about a substantiallyhorizontally disposed axis is' a- U-shaped bracket 16, the lamp bodybeing lpivotal'ly mounted between the upstanding arms 17 of thisbracket. As appears'most alent and in such manner that the vertical- -lydisposed web 19 thereof is spaced out wardly from said wall. The webs.19 of the fittings are centrally apertured, as at 23, for

permitting the passage therethrough of bolts 24 which latter projectthrough aligned openings25 provided in the upper portions of the'bracket arms 17 and between which the fittings 18 are embraced. Nuts 26threa d- I edly engage the outwardly projecting ends 'of'the bolts 24whereby thewebs 19 of the fittingsare respectively held against theinunderstooid'from the foregoing that the bolts 24 constitute relativelyfixed-bearings upon which the lamp bodyis supported for rotation about ahorizontally extending axisQ As appears in Figures'l to 4 the1bracket'16is in turnmounte'd for'rotation about'a vertical axis; the transverselyextending branch 27,,of the bracket 'being secured in superposedrelationjupon'ja suitable supporting base 28 throughjthe intervention ofa clamp .bolt 29 having an operatinghandle- 30.- --In-- asmuch. as thelamp body is '{carried by th'er bracket, angular "adjustment lot thelatter about a vertical axis (that is, with respect to the supporting-base 28) makes possible the 'fprojection of light "along any-desiredline extending radially from said vertical axls.

Attachedto and overlying the outer surface of one of the arms 17 of thebracket 16 (in this instance that at the left of Figure is a verticallydisposed plate 31 of segmental form; said plate being apertured, as

at 32, for passage of the laterally projecting ,bearingbolt 24. Asappears most clearly in Figure 6-this plate 31 is suspended fromthebearing bolt'24and is clamped against the bracket arm 17 by the nut 26.Preferably a washer 33 is interposed between the nut 26 and" thesegmental plate 31. In addition to the aperture 32, the plate131 isprovided in its bottom portion with an :arcuate slot- 34 that isconcentric with the aperture 32 and consequently with the pivotal axisof the lamp body. V g

Threadedly secured to the said bracket arm 17 and projecting outwardlythrough-f the arcuate slot 34-of the segmental plate 31 is a stud 35, 7They projecting end of the stud 35 'is threaded to take a wing nut 36 orthe like, the function of said wing nut'being to se-- curely clamp thesegmental plate 31 against the bracketarm' )17 whereby to prevent rota-[tionof the former about the bolt '24 as a center. It will beunderstood,of course, that by merely loosening the wing nut 36 the segmental plate31 may beshifted inclockwise or counter-clockwise direction, the ends ofthe arcuate slot'34 operating to limit the extent ofsuchmovementrelative to the bracket arm towhich the plate-is attached.Thus,

in Figure 2 the plate 31 is shown in one adjusted position relativetothe bracket arm,

while-in Figure 3 the plate is shown in another adjusted'position. -Theplate31 con- 'stitutes the indexing device by means of which apredetermined adjustment between 16 may be obtained. v

Hinged to the upper-edge of the's'egmental plate 31, as by a suitable'pintle 37, and adaptedto overlie the upper branch 20 of the pivotfitting 18 is a leaf member 38. This leaf member 38, which isprovided inits free edge with a comparatively widenotch 39, is swingthe lamp body'10 an'd its supporting bracket able toward 'and' away from said fitting18, the-arc of itsfmovementbeing indicated by the-dotted line of Fig.'6. It will be observed that'the inner 'port-ion 4O of the notch 39 isconsiderably reduced in width. Suitably secured to I and projectingupwardly of the upper branch 20 of the pivot fitting-13m a threaded stud41, said'stud being so disposed that when theleaf member 38 is in theopera- "tive position shown in Figures 2, 3 and Bit is closely embracedby the side Walls of, the reduced portion 40 of the notch 39. Thread-"edly engaging the projecting end of the stud 41 is a winged nut*42which operates, when tightenedup'on'its stud,-to lock the leaf member inoperative position. In order to swing ice . the leaf member upwardly andaway from the pivot fitting of the lamp body it is merely necessary tobackoff the wing nut l2 to an extent sufficient to permit the widenedportionof the notch 39 to pass freely over the said nut. It willbeunderstood, of course, that the leaf member 38 is shiftabie with thesegmental plate 31.

The operation of the indexing device can. now be described as follows.Figures 2 and 3 show two possible positioned adjustments of the lampbody relative to its supporting bracket, the former showing the lamppositioned for projection of light in a horizontal direction and thelatter for projection of light in a downwardly inclined direction. Tosecure these or other adjustments, it is first necessary to lock thelamp body to the segmental plate 31v through the leaf member 08 so thatthe lamp body and said plate 31 may be rotated'as a unit about thecommon axis of the bolts 24. Having determined the proper angularadjustment of the lamp body with respect to said axis, the segmentalplate 31 is then clamped securely to the adjoining arm 17 of the bracketby means of the clamping nut 36, the lamp body being thus maintained inadjusted position due to the fact that it is locked to the segmentalplate 31.

In order to swing the lamp body into the position shown in Figure &without disturbing the proper positional adjustment between said bodyand its supporting bracket, it is merely necessary to back ofi the wingnut 42 as explained hereinbefore to permit the leaf member 38 to beswung into the inoperative position shown by the broken lines of Figure6. The lamp body is then free to swing about the bearing bolts 24independently of the supporting bracket 16 and the segmental plate 31,yet said bracket and plate are maintained in their predeterminedly setrelation. Having performed whatever work is to be done on the lamp it isan exceedingly simple matter to swing the lamp body back into properposition such that the upper stud 41 may be again embraced by thenotched leaf member 38. All that then remains is to tighten the wing nut42. p i

It Will be understood, of course, that various changes may be made fromtimeto time without departing from the general spirit or principles ofthe invention and that said invention is equally applicable tostructures differing in form from that described herein. It isaccordingly intended toclaim the invention broadly, as well asspecifically, as indicated by the appended claims.

What is claimed as new and useful is:

1. In a lighting device, in combination, a lamp body, a support for saidbody arranged to permit angular movement of said body about an axisextending transversely thereof, an indexing member shiftable withrespect to said lamp body and said support about said axis as a center,and a swingable detent carried vby said shiftable means forquick-detachable engagement directly with" saidlamp body.

In combination, a lamp body adapted for angular adjustment about a fixedaxis, indexing-means for said lamp body including a pivoted memberhaving a free end arranged for releasable engagement with said body,means for securing said indexing means in adjusted position, and meansfor securing said pivoted member to said lamp body, thelatter beingfreely rotatable about said axis upon disengaging said pivoted membertherefrom.

I 3. In combination, a relatively fixed support, a lamp body mountedupon said support for angular adjustment with respect thereto, a platemember carried upon said. support, said member being also angularly.

berdirectly to saidlamp body whereby any angular movement of the formerwill be imparted to the latter, said connecting means i being operativeto insure only a single positional relation between said lamp body andplate member.

4. In combination, a relatively fixed supmember being provided with anarcuated port, a lamp body rotatably carried thereby, a plate memberadapted for rotation about the axis of rotation of said lamp body, saidslot concentric to said axis, means carried bysaid support andprojecting through said slot forsecuring sa1d member in a predeterminedangularly adjusted position with re spect tosaid axis, a slotted memberhinged to said plate member, the slotted portion thereof being adaptedto engage said lamp body, and means carried by said lamp body andprojecting through said slotted member for 'releasably securing saidbody to said plate member.

- .5. In combination, a lamp body arranged for rotation about arelatively fixed axis,

and an indexing device operatively asso-..:-.

ciated therewith, said device including a pair of hinged members, one ofwhich is adapted for angular adjustment about said c axis and theother'of which constitutes a de-' tacha'ble connection between saidangularly therewith, said device including a member 5.

angularly adjustable about said axis and having a hinged extension, thefree end of said extension being arranged to detachably engage said lampbody.

7. In combination, a lamp body arranged for rotation aboutarelatively'fixed axis I l and having an offsetportion; an indexingdevice also arrangedfor 'rotationgabout said axis, said device lncludingarhlnged element adapted to overlie said 'ofiset portion of said lampbody, and means carriedby said oflt'set portion for detachablycsecuringsaid hinged element to said offsetportion whereby upon shiftingsaidindexing deviceinto a predev termined adjusted position'a'corresponding I movement will be impartedft'o said lamp body, the latterbeing freely movable out of its adjusted position upon detaching saidhinged element from said offset portion.

8. In a lighting device, in combination, a i relatively fixed support, alamp body pivo tally carried uponsaid support androtat 40f said-stubshaft,-said member being shift-1 able relatively to said lamp body. I

I 9. In a lighting'unit, in combination a 7 lamp body adapted forrotation about a rela-' tively fixed axis, indexing means 'for'establishing, a predeterminedly fixed angular re-l "lation between said bodyand said axis, and

means arranged independently of said body for securing said indexingmeans in adjusted v position, said indexing means. including aswingableelement for connection to the body. said element beingdisconnectiblefrom the body to permit the latter to be freely rotatedabout said axis. i

I affixed my signature.

able about a relatively fixed axis, a member 1 rotatablewith said bodyabout said fixed' f axis, said body being'provided' with a radiallyextending stub-sliaftprojecting through said support and member, meansfor securf i mg 'saidmember ln adpistedrposltion, and I means for quck-detachably interconnecting.

said lamp body and member independently In testimony whereof, I havehereunto HERBERT J; GRAHAM.

